Feature Analysis of Oil-Film Instability Fault Based on Time-Frequency Methods in Rotor Systems

2009 ◽  
Author(s):  
Hui Ma ◽  
Wei Sun ◽  
Zhaohui Ren ◽  
Bangchun Wen
Keyword(s):  
Feature Analysis ◽  
Oil Film ◽  
Rotor Systems ◽  
Time Frequency ◽  
Film Instability

Research on Coupling Faults With Oil-Film Instability and Bearing Rub-Impact Based on Reassigned Wavelet Scalogram

2007 ◽  
Author(s):  
Xiaopeng Li ◽  
Hui Ma ◽  
Guiqiu Song ◽  
Bangchun Wen
Keyword(s):  
Low Frequency ◽  
Decisive Role ◽  
Frequency Resolution ◽  
Vibration Signals ◽  
Oil Film ◽  
Rotor Systems ◽  
Time Frequency ◽  
Coupling Faults ◽  
Film Instability ◽  
Frequency Components

An experiment rig was set up to simulate coupling faults with oil-film instability and local rub-impact. The collected vibration signals were roughly analyzed by 3-D waterfall spectra. In complicated frequency components domain, the vibration signals were analyzed with wavelet scalogram and reassigned wavelet scalogram. Results show that reassigned wavelet scalogram has higher time-frequency resolution than wavelet scalogram and can well identify such close low-frequency components. The analysis results also indicated rub-impact faults induced by oil-film instability can produce some low-frequency components with small amplitude and oil whip can produce half frequency component; rub-impact with a common extent exerts a light influence on rotor systems and nonlinear oil-film force plays a decisive role in rotor systems.

Time-frequency feature analysis and recognition of fission neutrons signal based on support vector machine

2010 ◽  
Vol 22 (10) ◽  
pp. 2441-2447
Author(s):  
金晶 Jin Jing ◽  
魏彪 Wei Biao ◽  
冯鹏 Feng Peng ◽  
唐跃林 Tang Yuelin ◽  
周密 Zhou Mi
Keyword(s):  
Support Vector Machine ◽  
Feature Analysis ◽  
Support Vector ◽  
Time Frequency ◽  
Fission Neutrons ◽  
Frequency Feature

Design and Closed Loop Testing of High-Pressure Centrifugal Gas Compressors for the Suppression of Subsynchronous Vibration

1980 ◽  
Vol 102 (1) ◽  
pp. 136-140
Author(s):  
A. F. Criqui ◽  
P. G. Wendt
Keyword(s):  
High Pressure ◽  
Critical Speed ◽  
Closed Loop ◽  
The Other ◽  
Oil Film ◽  
Rotor Systems

The causative phenomena of subsynchronous vibration, or re-excitation of the critical speed of a rotor, are discussed. Two rotor systems designed to control this type of vibration are presented. One system employs tuned, oil film damper bearings while the other features a stiffened rotor geometry. Stability thresholds of each design are compared based on high-pressure closed loop testing.

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